slider.js
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/*
detail页缩略图滚动插件
author:liuyue
date:2015-05-12
*/
define('plugins/slider', function(require, exports) {
var $ = require("jquery");
;
(function(global, undefined) {
var Slider = function(element, options) {
this.options = options;
this.$element = $(element);
this.$lis = this.$element.children();
this.len = this.$lis.length;
this.index = 0;
this.overWidth = 0;
this.init();
};
Slider.DEFAULTS = {
prevBtn: '.detail-slide-ctrl-prev', //向前控制按钮类
nextBtn: '.detail-slide-ctrl-next', //向后控制按钮类
wrapClass: '.detail-slide-ctrl', //包裹运动元素的层，用于计算运动元素的left
showNum: 6 //可视元素个数
};
Slider.prototype = {
init: function() {
this.$lis.eq(0).addClass('current');
this._setWidth();
this._bindEvent();
},
_setWidth: function() {
this.$element.width(this.$lis.eq(1).outerWidth() * this.len);
},
_bindEvent: function() {
var that = this,
timer;
//网页改变大小时重新计算宽度
$(window).resize(function() {
that._setWidth();
}).resize();
this.$lis.on('click', function() {
if (that.$element.is(':animated') || $(this).attr('class') == 'current') return;
that.slideTo($(this).index());
})
if (this.len >= this.options.showNum) {
$(that.options.prevBtn).show().on('click.prev', function() {
that._prev();
});
$(that.options.nextBtn).show().on('click.next', function() {
that._next();
});
}
},
_animate: function(offset) {
if (this.$element.is(':animated')) return;
this.$element.stop().animate({
'left': offset
}, 300);
},
slideTo: function(index) {
var that = this,
left = Math.abs(parseInt(this.$element.css('left')));
this.$lis.eq(index).addClass('current').siblings().removeClass('current');
if (this.len < this.options.showNum) return;
if (this.$element.is(':animated') || $('.detail-slide-piclist .box').is(':animated')) return;
//console.log(index);
if (index === that.options.showNum - 1 + parseInt(left / that.$lis.eq(1).outerWidth()) && left < this.$element.outerWidth() - $(this.options.wrapClass).outerWidth() - this.overWidth) {
$(that.options.nextBtn).trigger("click.next");
} else if (index === 0 && left !== 0) {
$(that.options.nextBtn).trigger("click.next");
} else if (index === parseInt(left / that.$lis.eq(1).outerWidth()) && left > 0) {
$(that.options.prevBtn).trigger("click.prev");
} else if (index === that.len - 1 && left === 0) {
console.log(left);
$(that.options.prevBtn).trigger("click.prev");
}
},
_prev: function() {
var offset;
if (this.$element.is(':animated')) return;
this.overWidth = this.$lis.eq(1).outerWidth() - this.$lis.eq(1).width();
this.index--;
offset = -this.$lis.eq(1).outerWidth() * this.index;
if (offset > 0) {
offset = -(this.$element.outerWidth() - $(this.options.wrapClass).outerWidth() - this.overWidth);
if (this.len === this.options.showNum) {
this.index = 1
} else {
this.index = this.len - this.options.showNum;
}
}
this._animate(offset);
},
_next: function() {
var offset;
if (this.$element.is(':animated')) return;
this.overWidth = this.$lis.eq(1).outerWidth() - this.$lis.eq(1).width();
this.index++;
offset = -this.$lis.eq(1).outerWidth() * this.index;
if (this.index >= this.len - this.options.showNum) {
offset = -(this.$element.outerWidth() - $(this.options.wrapClass).outerWidth() - this.overWidth);
}
if (parseInt(this.$element.css('left')) === -(this.$element.outerWidth() - $(this.options.wrapClass).outerWidth() - this.overWidth)) {
offset = 0;
this.index = 0;
}
this._animate(offset);
}
}
function Plugin(option, _relatedTarget) {
return this.each(function() {
var $this = $(this);
var data = $this.data('yoho.Slider');
var options = $.extend({}, Slider.DEFAULTS, $this.data(), typeof option == 'object' && option);
// 如果没有初始化，则初始化该对象，并且把该对象绑定到此元素的yoho.PicSilder属性下。
if (!data) $this.data('yoho.Slider', (data = new Slider(this, options)));
// 如果传递的options是一个字符串，则表示调用改对象的原型方法。
if (typeof option == 'string') data[option](_relatedTarget);
});
};
$.fn.slider = Plugin;
$.fn.slider.Constructor = Slider;
})(this);
});